Render being cropped?
Your background image is limiting the size of your render. If you look closely, you will notice that the render image that is not black is exactly the same size and color of the texture. The rest of the camera view is filled with the default black, or if you check Film > Transparent with a transparent alpha value.

You will either need to change the size of your image, or do some work in your compositor.

One way to do this is to add a Scale node after your image texture like this:



(Shift+A > Distort > Scale)

The result now looks like this: